Alarm system.



jfillr lllr E A. GOLDSTEIN ALARM sYsTBM. APPLICATION FILED MAB. 9, 1910.

Patented Au 9,1910.

UNITED STATES PATENT OFFICE.

ALBERT GOLDSTEIN, OF NEW YORK, N. Y., ASSIGNOR T0 ELECTRIC PROTECTION COM- 7 PANY OF NEW YORK, A CQBEORATION OF NEW YORK.

ALAm/r SYSTEM.

Specification of Letters Patent. Application filed March 9, 1910. Serial No. 548,259.-

Patented Aug. 9, 1910.

To all whom it may concern:

"Be it known that I, ALBERT GoLDs'rEIN, a citizen of theUnited States, residing at the city otNew York, in the borough of Man-, hattan and State of New York, have invented certain new and useful Improvements in Alarm Systems, of which the following is a full, clear, and exact description.

This invention relates to central energy alarm systems and has for its object the release of the alarm transmitter by energy from the central batter as long as the line wire either way from t e transmitter is in: tact.

In the figure 1, which embodies a typical form of my invention, the normal circuit is as followsz-from source A (here shown in two parts with a ground connection G be tween the two), through alarm repeating relay D, line 1, to transmitter T and therein from junction X to wire 2, contact 3, switch arm 4., wire 5, switch arm 6, contact '7, wire- 8 and junction Y to line, 20, alarm repeating relay E, tosource A.

In transmitter T the circuit from junction X through wire 9, magnet H Wire 10, switch arm'll, contact '12, switch arm 13, contact,14=,= f wire 15, magnet H to junction Y is normally shunted by the circuit previously destribed and hence magnetsI-I and H are denergized, armature h is retracted,

the end k ienga es the pallet tail t, and the end if engages t e notch in winding drum w of the normally wound transmitter T, reg straining the movement of the same. A normally open ground connection is also r0- vided-from junction of contact 12 and switch as ltollows;-The switch .2 is

arm 13, by wire 16 to switcharm 17 and contact 18 to ground G 7 The normal operation of the system is operated by "any suitable-means, opening circuit at contact 7. Current in transmitter T now flows from junction X to junction Y through wire 9, magnet H wire 10, switch arm 11, contact 12, switch arm 13, contact 1d, wire 15, and magnet H Both magnets become energized, attract armature h, releasing pallet tall 11 and winding drum w and allowing the.

break wheel- M to rotate and make periodic interruptions ill the circuit by means of switch arms 11 and 13 which are received at a suitablepoint by means of relays D and E, which through their armatures d, 0, control lamps P, Q.

Assume now a break in wire 1 say at Z. The opening of contact 7' as before does not cause any current to flow through magnets H or 11, so I provide a second switch arm 17 and contact 18 which "close circuit. to ground G Upon the operation of switch 8 a circuit is then established as followsfrom source A, relay E, line 20, junction Y,-

magnet HF, wire 15, contact 14, switch arm 13, wire 16, switch arm 17, contact 18 to 5 ground G and thence by ground G to source A. Magnet H is now energized and attracts armature h, releasing the transmitter as before, the signals being received only through relay E. Y

Assume now a break in wire 20 say at Z; then as before upon the opening of contact 7 nocurrent is established through magnets H or H Upon the closing of contact 18, however, a circuit is established as follows from source A, through relayD, line 1, junction X, wire 9, magnet H wire 10, switch arm 11, contact 12, wire 16, switch arm 17 contact 18, to ground 6- and thence by ground G to source A. Magnet H is now energized and attracts armature h, releasing the transmitter as before, the signals being 7 received only through relay-D.

Cam N is provided to close circuit to ground G and to open shunt from motion- X to junction Y independently o switch, arms 17and 6, so that premature restoration of the switch arms to their original osition will not afl'ect the transmission .0 the signal from break wheel M. It will then be obvious that as long as either line wire 1 or 20, is intact so that a signal could be received at the central station, the transmitter T can be released from the central battery,

batteries at thus avoiding the use of local the signal station.

I claim ,1. A line circuit, a normally groundedsource of current for same, a plurality of normally closed shunt around saidreleasing A means, a normally open connection to groun between sa1d releas1ngmeans,and means for opening said shunt and closing said open a connection; to eflect the operation of said releasing means.

2. Two sources of current, a ground connection between the same,.a metallic circuit including said current sources; an independently 0 erable switch in said circuit, a translating evice in each member'of saidcircuit and in shunt circuit, a transmitter,' a ground connection therefrom, and means for releasmg said transm tter: the switch in sald metallic circuit being normally closed to short-circuit said shunt circuit. I

'3 Two sources of current, aground connection between the same, a metallic circuit including said current sources, a translating device in each member of said'circuit and in shunt circuit, a transmitter, a ground con-. nection therefrom, two electro-magnets controlling said transmitter to release the same, a ground connection between said magnets, swltches respectively interposed in sai last named ground connection and in said metal lic circuit, and means for simultaneously operating saidswitche's to open said circuit and close saidground connection.

In witness whereof, I subscribe my signature, in the presence of two witnesses;

ALBERT GOLDSTEIN.

Witnesses: WALTER L; BUNN IJL,

B. (l-AUs 'rIN. 

